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Home›Duel›Porsche 718 vs BMW 420d

Performance comparison

Porsche 718 Boxster S vs BMW 420d Convertible G22: which is truly faster?

Simulated drag race 0 → 1,000 m in real time. Synchronised speed counters and stopwatch. Physics calibration on 7 manufacturer measurements.

PorschePetrolFaster

718 Boxster S

350 hp · 420 Nm · 1,355 kg · 2017

VS
BMWDiesel

420d Convertible G22

190 hp · 400 Nm · 1,775 kg · 2021

MotorwayRange & chargingPerformance0-100, top speedConsumptionAnnual TCO

Parameters and assumptions

Simulation

Start
Standing, straight line
Surface
Dry asphalt, 23°C
Wind
None
Driver
1 person, 75 kg

Calibration

Splits
0–100, 0–200 manufacturer
Power curve
Real measurement (Caralogy)
VMax
Manufacturer limited
Transmission
Losses integrated in model

Physics model calibrated on manufacturer splits. The limited top speed is not the real aerodynamic top speed of the vehicles.

718 Boxster S420d Convertible G22
0–100 km/h4,16 s−3,59 s7,75 s
400 m standing start12,06 s−3,58 s15,64 s
1,000 m standing start21,70 s−6,99 s28,69 s
Top speed (electronically limited)285 km/h+49 km/h236 km/h
Power-to-weight ratio3,87 kg/hpbetter ratio9,34 kg/hp

Watch the race

Standing-start drag race, calibrated on manufacturer splits. The gap shows at each stage.

PorschePetrol718 Boxster S
Speed
0km/h
Timer
0,00s
Distance
0m
BMWDiesel420d Convertible G22
Speed
0km/h
Timer
0,00s
Distance
0m
100 m
200 m
300 m
400 m
500 m
600 m
700 m
800 m
900 m
1000 m
0m → 1000m
Gap0m

Stage-by-stage comparison

Simulated performance at each stage. Winner in green.

Palier718 Boxster S420d Convertible G22
0–30 km/h1,18 s1,52 s
0–50 km/h1,98 s2,64 s
0–80 km/h3,21 s5,29 s
0–100 km/h4,16 s7,75 s
0–120 km/h5,25 s10,87 s
0–160 km/h8,26 s20,11 s
0–200 km/h12,69 s37,54 s
400 m standing start12,06 s15,64 s
1,000 m standing start21,70 s28,69 s
Top speed285 km/h236 km/h

Under the bonnet

Manufacturer technical specifications. The power-to-weight ratio is the key physical factor in a drag race.

Porsche

718 Boxster S

3,87kg/hpratio better by 5,47 kg/hp
CharacteristicValueDetail
Power350 hpB4
Torque420 Nm
Weight1 355 kgmanufacturer kerb weight
DrivetrainPropulsion
GearboxDUAL_CLUTCH
BMW

420d Convertible G22

9,34kg/hpcompensated by −420 kg
CharacteristicValueDetail
Power190 hp4 cyl
Torque400 Nm
Weight1 775 kgmanufacturer kerb weight
Drivetrain420d Convertible
GearboxEight-speed Steptronic transmission

The start: 0 to 100 km/h

Off the line, the 718 Boxster S hits 100 km/h in 4.16 s versus 7.75 s for the Bmw 420d Convertible. At this point, the 718 Boxster S leads by 3.59 s and sits roughly 16 m ahead.

From 100 km/h to 400 metres

At 200 metres, the 718 Boxster S is doing 157 km/h against 116 km/h for the Bmw 420d Convertible. The gap is 2.10 s. The challenger starts to claw back ground.

At 400 metres standing start, the 718 Boxster S crosses the line in 12.06 s versus 15.64 s. The 3.58 s gap represents roughly 134 m of track — a gap visible to the naked eye.

Beyond 400 metres: top speed comes into play

Past 400 metres, the 718 Boxster S continues to build its lead. At 600 metres, it runs at 218 km/h versus 161 km/h. At 1,000 metres, the 718 Boxster S finishes in 21.69 s versus 28.69 s, with a 6.99 s lead.

What the numbers don’t tell you

Both rivals are electronically governed, but not at the same level: the 718 Boxster S is capped at 285 km/h, the Bmw 420d Convertible at 236 km/h. This isn’t a physical engine limit — it’s a manufacturer choice, usually for tyre safety or homologation reasons. Neither car reaches its true aerodynamic top speed.

With two combustion powertrains, the difference comes down to power-to-weight ratio (3.87 kg/hp vs 9.34 kg/hp) and transmission (Automatic vs Automatic).

In European road use (130 km/h max), both vehicles reach the legal speed limit in under 12.82 seconds. The 3.59 s difference in 0 to 100 km/h is mostly felt in motorway merging and overtaking.

Compare with other alternatives

Swap one of the two models to explore an equivalent duel in the same segment.

Instead of 420d Convertible G22
Bmw 420i ConvertibleBmw 218i ConvertibleBmw 220d Convertible

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Frequently asked questions

Sur 0–100 km/h, 718 Boxster S gagne (4,16 s vs 7,75 s).

718 Boxster S passe de 0 à 100 km/h en 4,16 secondes (simulation calibrée).

718 Boxster S : 350 hp, ratio 3,87 kg/hp. 420d Convertible G22 : 190 hp, ratio 9,34 kg/hp.

718 Boxster S : 285 km/h. 420d Convertible G22 : 236 km/h.